Development of a Diffusion Mobility Database for Co-based Superalloys
Greta Lindwall, Kil-Won Moon, Carelyn E. Campbell, Maureen E. Williams, Whitney Tso
To facilitate the development of high-temperature Co-based - superalloys, a Co-Ni based diffusion mobility database is developed for the eight component FCC (Face Centered Cubic) system of Co-Al-W-Ni-Cr-Ti-Ta-Re. A CALPHAD approach is used to represent the temperature and composition dependency of the multicomponent system. The mobility descriptions are based on previous assessment work for the Ni-based superalloys, published experimental and computational data, and established diffusion correlations. The initial mobility descriptions were then refined using additional diffusion couple experimental data, particularly for the Co-Cr, Co-Ta, and Ni-Ta systems. After re-optimizing the descriptions with the new experimental data, the mobility descriptions were validated using a collection of published diffusion couple composition profiles, which were not included in the initial assessment process.
, Moon, K.
, Campbell, C.
, Williams, M.
and Tso, W.
Development of a Diffusion Mobility Database for Co-based Superalloys, Journal of Phase Equilibria and Diffusion, [online], https://doi.org/10.1007/s11669-022-01011-1, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935295
(Accessed September 25, 2023)